Selective control system and apparatus



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SELECTIVE CONTROL SYSTEM AND APPARATUS Filed Sefit. 19, 1929 15 Sheets-Sheet 4 7 mmvroR. [02111: 11/. 2 0/66 ATTORNEY Oct. 25, 1938. L. M. POTTS 2,134,005

SELECTIVE CONTROL SYSTEM AND APPARATUS Filed Sept. 19, 1929 15 Sheets-Sheet 5 PR/Arrty was 7i? INVEINTOR BY [01/16 1 Poi/S ATTORNEY5 Oct. 25, 1938. L. M. POTTS SELECTIVE CONTROL SYSTEM AND APPARATUS Filed Sept. 19, 1929 15 Sheets-Sheet 6 ABCDEFGHIJKLMNOP QIZSTUVWXYZ B8:

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SELECTIVE CONTROL SYSTEM AND APPARATUS Filed Sept. 19,1929 l5 Sheets-Sheet 7 INVENTOR. [M13 1?. 2 01/6 BY I ATTORNEYJ Oct. 25, 1938. L. M. POTTS SELECTIVE CONTROL SYSTEM AND APPARATUS l5 Sheets-Sheet. 8

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SELECTIVE CONTROL SYSTEM AND APPARATUS Fiied Sept. 19, 1929 15 Sheets-Sheet 10 I I Z0431? Raf/6 9 ATTORNE Oct. 25, 1938. L. M. POTTS 2,134,005

SELECTIVE CONTROL SYSTEM AND APPARATUS Filed Sept. 19, 1929 15 Sheets-Sheet l1 gzi? INVENTOR.

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BY WQW Jm ATTORNEYS Oct. 25, 1938; I POTTS 2,134,005

SELECTIVE CONTROL SYSTEM AND APPARATUS Filed Sept. 19, 1929 15 Sheets-Sheet 13 lzzwL 12.9.9

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I L. M. Po'n's SELECTIVE CONTROL SYSTEM AND APPARATUS Filed Sept; 19, 1929 .15 Sheets-Sheet 14 IIIIIJ :l IIIIIL 2 .Zoazofll. fatter farm/Ev Oct. 25, 1938. L, M, Pom 2,134,005

SELECTIVE CONTROL SYSTEM AND APPARATUS Filed Sept. 19, 1929 15 Sheets-Sheet 15 IINVENTOR. Jae/as M20156,

Patented oee zs, 193sv r 2,134,005 snuzc'nvn CONTROL SYSTEM m APPA- Barns Louis M. Potts, llvan ston, 11]., assignor to Teletype Corporation, Chicago, 111., a corporation of Delaware Application September 19, 1929, Serial No. 393,101 89 Claims. (01. 17H) The present invention relates to selective control systems and apparatus, and more particularly theinvention relates to remote control systems and apparatus especially applicable to automatic stock quotation indication, but useful in other relations.

An object of the present invention is to provide novel signalling systems adapted for operation Over and in conjunction with emsting printing telegraph lines so that efficient methods of transmission may be used without substantial change in or interference with commercial message trafflc and also so {that a new method especially adapted to new demands can also be used and applied to existing systems so that on each circult the most suitable method of operation can be used.

The specific embodiments of my invention hereinafter set forth are developed in connec tion with and as improvements on quotation distribution systems of the general type'disclosed in my co -pending application Serial Number 33 ,161 filed January 17, 1929, in which complete cycles oioperations each includes the selection of a register, setting up of a quotation on the register, and identification of the type of the quotation and in which each cycle includes successive code combinations all of which may or may not be made up of an equal number oi selecting conditions. :Iowever, as existing permutation code telegraph channels are designed for equal interval code combination transmission, the systems and apparatus as disclosed in my application Serial No. 333,161 cannot be directly applied to operation over existing telegraph channels without some modification thereof, unless certain of the impulse periods are not used. and line time is lost.

Since the existing main telegraph printer circuits comprise many multiplex channel transmission lines, another object of my invention" is to provide methods and means for operating a quotation indicating system of the general type disclosed in said co-pending application over one or more -of the channels of a multiplex telegraph system between geographically remote points.

Still another object of' my invention is to provide methods and means for operating a remote indicating system of the character mentioned in whicheach cycle of operation comprises a predetermined number of code combinations of impulses for operation over standard start-stop telegraph systems without loss of any impulsing time.

A further object of my invention is to provide methods and means for utilizing idle impulse in- Q tervals in a system of the character described operating over telegraph channels where the number of impulse intervals available in the telegraph channel is greater than the number of signalling conditions comprising the code combinations utilized.

Still a; further object 01 my invention is to provide signalling methods and apparatus for transmitting a plurality of code combinations channel period.

Another object of my invention is to provide means for adapting a single channel'in a multiplex telegraph system for successively selectingcode combinations from a plurality of channels of a difierent type of selective remote control systeml Another object of my invention is to provide methods and means for re-transmitting a plurality oi selective code combinations of impulses each received from a diiferent transmission channel over a single telegraph channel. I

Still a further object of my invention is to provide methods and means for invariably and automatically controlling the sequence of transmission of successive code combinations of impulses of a complete cycle in a stock quotation remote indicating system.

Still a further object of my invention is to providefiexible means to adapts system for transmission of any one of a plurality of diflerent types of code combinations thereover and for readily translating any one type of coding to another type of coding.

Still a further object of my invention is to pro vide methods and means for synchronizing each revolution of transmitting and receiving distributors and for synchronizing the distributors for each successive cycle comprising a plurality of code combinations of impulses in selective control systems.

Still a further object of my invention is to provide methods and means in a control system of the character mentioned, for distinguishing the beginning of each cycle of code combinations of impulses and the beginning of each of the code combinations constituting a cycle.

Still a further object of my invention is to provide novel code combination storing apparatus, transmitting and receiving arrangements for a system of the character mentioned.

A further object of my invention is. to provide means for preparing a perforated tape at the receiving end of a system of one type of trans- REISSUED se 1942- over a single telegraph channel during a single m mission system and to use this tape .to control another type of transmitting circuit.

Still further objects of the present invention will appear hereinafter in the description of the details of the preferred embodiments thereof and are such as may be attained by utilizing the various combinations and sub-combinations hereinafter set forth and as defined by the terms of the appended claims.

Referring tothe drawings:

Fig. 1 is a diagrammatic view of the preferred embodiment of my invention showing the circuit and apparatus employed for perforating a tape in accordance-with my special code combination arrangement.

Fig. 2 is a similar view disclosing an alternative arrangement of keyboard perforator.

Figure 3 is a diagrammatic view of the circuits and apparatus of the transmitter arrange- 90' ment employing the tape prepared by the perforator shown in Fig. 1.

Fig. 4 is a diagrammatic view of a preferred embodiment of the receiver circuits and apparatus associated with the transmitter shown in H8. 3.

Fig. 5 is a diagrammatic view indicating the timing of the various cams for the form of invention shown in Fig. 4 during the signal intervals for a complete group or cycle of signals.

Fig. 6 is a diagrammatic view of the circuits and apparatus for a modified transmitting distributing arrangement having a single stop segment and a large number of code combination segments used in connection with a transmitter having a lesser number of transmitting contacts.

5 rality of different Fig. 'I shows a modified form of sequence switch-for controlling the order in which code combinations are sent in the preferred embodiment of my invention.

. 40 Fig. 8 shows a modified circuit arrangement for the sequence switch shown in Figure'l.

Fig. 9 shows a small section of the tape prepared on the perforator.

Fig. 10 is a schematic circuit diagram of a plutypes of transmission systems in all of which the phasing is controlled by the index perforations in the tape of Fig. 9 as punched by the perforator in Fig. 1.

Fig. 11 is a diagrammatic view of the multistart' printer connected in one of the systems of Fig. 10 with line relay distributors controlling cams both fast and slow and the permutation code bars of a printer suitable for printing in tape form the stock quotation messages.

Fig. 12 is a sectional detail view of a typical type bar and its selector bar associated with the apparatus shown in Fig. 11.

Fig.13. is a chart of alphabetical characters, numerical figures and fractions codes.

Fig. 14 is a diagrammatic view of a receiving distributor and a perforator for preparing a six unit tape.

Fig. 15 is adiagramrnatic view of a'giant receiving distributor connected in another of the 5 systems of Fig. 10 arranged to distribute the signal pulses transmitted by the transmitting distributor of Fig. 6 to thirty-four operating magnets. I

Fig. 15a Is a diagrammatic detail view of a cam and switch assembly which functions in connection with the distributor of Fig. 15.

Fig. 16 shows the code of Fig. 17.

Fig. 1'7 shows a receiving distributor arranged to translate from the code of the transmitter'in Fig. 6 into the code of Fig. 16.

.Fig. 18 is a diagrammatic view of a receiving distributor or translator which translates from the code 01' the transmitter of Fig. 6 into the code of the perforator of Fig. 14.

Fig. 19 shows a conventional transmitter combined with a cam and relay system for a multiplex sending distributor of 35 segments. Fig. 20 shows a modified receiving distributor I for another of the systems of Fig. 10.

Fig. 21 shows a conventional multiplex distributor operating in conjunction with three conventional multiplex transmitters and one specialized multiplex sender.

Fig. 22 is a diagrammatic view of a receiving distributor for a commercial multiplex system in which one channel of five segments is translated into a code suitable for operating a printer. 7

Fig. 23 is a diagrammatic view of a' distributor auxiliary to the multiplex distributor, which distributes the code signals to the 34 operating magnets of the stock quotation board.

Fig. 24 illustrates a manner of connecting generators of opposite potentials.

For purposes of illustration, the invention has been described as applied specifically to'a stock quotation system although it will be understood that the invention is equally applicable to any remote control system.

'Tape pe forator In Fig. 1 are shown a plurality of letter levers I, one for each of the letters of the alphabet, a plurality of numeral levers 2, one for each of the numerals 0=to 9, a plurality of fraction levers I, one for each of the fractions V8 to V. and a plurality of designation levers 4- each shown pivotally mounted on a shaft 5 secured to the, frame work. Each of the levers I to 4 is provided with a spring 6 one end of which is secured to the rear end of the lever and the other end to the frame work. These spring members 6 normally maintain the levers I to 4 in their upper or non-operated position. The forward end of each of the levers I to 4 extends through an individual siot' I in a guiding comb 6 which extends transversely so that a lever Ito 4 rocked about shaft I moves in a vertical plane within a guide slot 1.

Extending underneath the levers I to 4 at right angles thereto are a set of permutation bars I, I and III. The upper edges of these bars are provided with angular notches II, as shown, ar ranged in various combinations, and are disposed in operative relation to the lower edges of the levers I to I so that. upon depression of any one of the key levers I to I, certain ones of these permutation bars 8, 9' and III are moved to the left or right asthe lower edges of the levers engage them.

The five bars 9 and 9' are normally free to move ineither direction and are moved to the right or left depending upon the inclination of the surfaces adjacent the notches II which are engaged by a depressed key. The bars 9 are operated to the right or left by the letter, numeral or fraction key levers, I, 2, and 3. Bar 6 is moved to the right by all letter and number keys and to the left by the fraction keys only.

The permutation bar III, which corresponds to the 5th code element is normally held to the right by the spring I'I, acting through the armature I3 and notch ii in bar III. It may be moved to its left hand position only by letter levers I and also may be operated to the left by armature ii, of an electromagnet I4, which extends into a notch IS in the lower edge of the permutation perforating pins 3| protrude when operated inbar i8. .The bar I8 is cut away under the number and fraction keys so that the latter may not operate it. pin l8 and is normally held in non-operated position by action of spring l1, one end of which the left about pivot l6 and moves the bar l8 to,

the left. The sixth bar 9' functions to periodically perforate the tape for phase indication as will be explained. The notches l I in this bar are so cut that it is shifted to the left for perforating the tape only upon operation of a fraction key lever 3..

As will appear hereinafter, the permutation bars 9, 9 and I8 when in their left position condition the perforator to perforate a tape. Each bar is provided with a notch- 2| at its left hand end in which is carried the end of a connecting lever 22.- Connecting levers 22 are pivotally mounted on the pin 23 and at their upper ends are provided with cars 24 in which are pivoted at 25, the perforator pin interponents 26. The interponents 26 are guided in a comb 21 carried on the perforator table 28 and are provided with lug projections 29 at their extreme left hand ends In operative relation with each of the interponents 26 is an individual perforating pin 3| provided with a movement limiting shoulder 32 and slidably supported in shelf 33 of the perforator block 34. The perforator block 34 comprises in addition to the shelf 33 a die plate 35 and a guide plate 36 between which a tape 31 to be perforated is fed. The die plate and the guide plate areprovided with perforator pin holes 38 and a central feed hole 39 through which the a manner to be described. Normally the pins 3| are in their lower position (as shown) projecting through the lower plate 36 only.

The perforator table 28 is provided with projecting arms 4| pivotally mounted on the shaft 42 about which it is rocked by the solenoid plunger 44 of the solenoid 45 carried on the frame work inany well known manner. As will appear hereinafter. the solenoid 45 is periodical ly energized tooperate the plunger 44 upwardly which in turn rocks the table 28 clockwise about its pivot 42.. As the table is rocked the pins 35 which are above the lugs 29 of those levers 26 which have been selectively interposed, will be pushed through the tape making perforations therein. When solenoid 45 is deenergized, a return spring acting upon table 28.restores the latter as well as the solenoid plunger 44 to-its normal position.

A bracket 46 is secured to the table 28 and its projection 47 engages one arm of a lever 49 pivotally secured at 5! so that as the bracket 48 reciprocates vertically together with the table 28,

" the former is oscillated concordantly. Upon its clockwise movement, the lever 49 carrying a spring loaded pawl 53 thrusts the latter rightwardly, causing it to engage the next succeeding tooth of a ratchet wheel 58 mounted on shaft 59. Upon deenergization of magnet 45, table 28 is returned by it spring to its normal position which allows bracket 46 to assume a position whereby the spring loaded pawl moves ratchet wheel 58 to cause, through pin wheel 6| carried by shaft 59, the advancement of tape 37. Since The armature I3 is pivoted on the the downward or return movement .of bracket 45 through its articulation 41, causes the clockwise motion of lever 49 and through it the feeding movement of pawl lever 53, it will be seen that the tape 31 is advanced after the punches 8! have been withdrawn. k

The ratchet wheel 58 is secured to shaft 59 which carries the feed wheel 5| rotatable there with. The-wheels 58 and SI have the same number of teeth. The feed wheel 6| is provided with feed teeth 82 which engage with the central feed perforations on the tape. On each step in the rotation of the shaft 59, the tape 31 is moved one step to present a fresh surface for perforation.

comprising a cam 61 which moves into operative relation with the contacts 78 to 8| suc- At the other end of the shaft 59 is a gear as cessively for the purpose of controlling the sequence of code transmissi n.

The contacts 18, H and 12 are connected in multiple over the conductor 83 to ,a contact 84 in operative relation with contacting member 85. The contact member 85 it will be noted, is carried by an insulating block 86 onthe universal ball 89 in operative relation with the lugs 98 on the letter keys I. The universal bail 89 is pivotally mounted on shaft 92 and held against lugs 98 by action of a spring 93. As will be clear, upon the operation of any one of the letter keys I, the lug 98 thereof operates the universal ball 89 about shaft 92 causing the contact 85. to engage contact 84 and extending the negative side of battery over the'conductor 83 to contacts 78 to 72. a I

The opposite terminals of the contacts 18 to 12 are connected in multiple and. over the conductor 95 to the perforator solenoid 45 so that when any of the contact pairs 18 to 12 is closed, a circuit is prepared contemplating the operation of a key lever l to energize the solenoid 45.

The conductor 95 is also connected in multiple with the contact pairs 76 to 18, the opposite terminals of which are multipled over the conductor 9'! which extends to the contact I81 which in turn is in operative relation with the contacting member I82 carried through the insulating block I83 on. the universal bail I84. The universal bail I84 is in operative relation with lugs I85 on the numeral key levers 2. Upon operation of any one of these numeral key levers, the contact member I82 closes with contact l8! and extends negative potential to the conductor 91. A circuit is prepared upon the closure of any of the contact pairs 16 to 18 and is then subject to completion upon the operation of a key lever 2. It will be .ber H3 carried through an insulating member H4 as in the previous cases by-the universal bail I I5 which is operated through the lugs I l 8 on the fraction key levers 3. Solenoid 45 however cannot be operated upon depression of any of the engagement with its front locking circuit for the relay I23 through the back fraction keys 3 except when contact 30 is closed by the sequence switch cam 33.

It will be noted further that the contacts 13 to 15 and 19 are connected in multiple over the conductor magnet I4 of the code bar ID as described above. The opposite terminal of the contact 13 extends over the conductor I2I, to the front contact I22 of the'relay I23.

The circuit for relay I23 extends over the conductor I24 to the contact I25 of the key lever 4 designating Open quotation. When therefore the Open quotation key lever is closed, negative potential is impremed to energize relay I23. Relay I 23 is provided with armatures I23 and I21, armature I23 when in contact providing a contact and armature I21 of the relay I28. Relay I28 is connected over conductor I23 to contact 8|. When the cam 31 between the end of one cycle and beginning of the next cycle closes contact 8|, the circuit for relay I28 is closed. Relay I28 is'energized and opens the locking circuit of any relay such as relay I23, the locking circuit of which is completed over armature I21. When however, the relay I23 is deenergized the locking circuit for relay I23 may be completed over armature I23 and its front contact and the back contact of armature I21 to the negative side of battery. Y

Similar relays I3I, I32 and I33 are connected over conductors I34, I33 and I33 respectively to the contacts I31, I38 and I33 respectively the High, Low and Last designation keys 4. Relays I3I to I33 are energized selectively inaccordance with-which of these particular designation key levers is operated. These relays I3I to I33-are provided with locking armatures "I to I43 connected in multiple with the locking armature I23 to the back contact of the armature I21, and are also provided with armatures I44 to I43, the front contacts of which extend over conductors 1 to I43 to contacts 14, 13 and 13 respectively.

At the beginning of a cycle the sequence switch 33 will be in the position shown with cam portion 31 closing the contact 13, the remaining contacts on the sequence switch 33 being open. The circuit for the perforator solenoid 43 including conductor 35 it will be noted, is at this time open at all its multiple contacts on the sequence switch except contact 13 and accordingly the solenoid can be energized'only upon the closing of contact 84 connected to conductor 33. vAccordingly at.

this point only the operation of a letter lever I will complete an energizing circuit for the solenoid 45. n

In order to transmit a quotation, the operator will successively depras three letter levers. I, three numeral levers 2, and a fraction lever 3. If it is necessary to depress any designation or range key lever, it may be done either before or after depressing the letter levers, but must be done before depressing the numeral or fraction levers. Upon the operation of a range designation key lever 4, such as High, a circuit is completed for relay I3I from the negative side of battery through contact I31, conductor I34, relay I3I and positive side of battery. Relay |3I is energized and locks over armature HI and I21 as described above. Its operation however has no effect at this time. Upon the depression of the first letter lever I, the five permutation bars 9 and III will be selectively operated to the right or left depending upon the particular letter lever I23 which extends from the operating v upon the conductor I24 operated in a manner well known in the art. As a result, the individual connecting levers 22 will be selectively rocked about pivot 23 and selectively move pin operating levers 23 to the right or left until their lug portions 23 are under or not under the perforating pins 3|.

The depression of this letter lever I also closes the contacts and 84 completing an energizing circuit for the perforator'solenoid 45 from the negative side of battery to the contacts 83 and 84 over conductor 83, contact 13, conductor 33 through the solenoid 45 to the positive side of battery. As a result, the solenoid 43 is energized and operates itsplunger 44 upwardly rocking the perforating table 28 about shaft 42 and moving thosel pins 3| which are in operative engagement with the lugs 29 through the tape 31. As the table is moved upward, the extension portion 41 moves the pawl 53 to engage the succeeding tooth on the feed ratchet wheel 58.

When now the letter lever I is released and the contacts 34 and 85 disengage, the solenoid 45 is deenergized and the operated perforating pins 3| are removed from the tape 31. As the table 28 moves downwardly about its pivot the feed pawl '53 operates the ratchet wheel 33 one step which in turn rotates the shaft 33. The

feed wheel accordingly moves the tape 31 one step and a fresh portion of the tape is presented for the next group of code combination characters.

At the same time, the gear 33 rotating the distance of one tooth of the ratchet wheel rotates the pinion 34 in a clockwise direction vwhich in turn rotates the shaft 33, and the sequence switch 33 is rotated so that the cam portion 31 disengages the contact 13 and engages contact contact 13 is opened and contact, 1| is closed. This however, has no eifect at this time inasmuch as no letter lever is closed. When, however, another letter lever is operated a second energized circuit will be completed for the perforator'solenoid 43 similar to that described in the first case, except that in this instance the circuit will be completed through closed contact 1|. It will be noted that this circuit for the solenoid 43 will not be energized un-' less the second key lever to be operated is of the class of key levers I.

The operations will be similar to that described in the above cycle of operation, the perforations being in accordance with the particular key lever operated and the tape being fed to a succeeding position immediately after a perforating operation as in the above case. The

sequence switch 33 will thereupon be rotated to close contact 12. At this position a circuit for the solenoid 45 can only be completed upon the operation of a leter lever I.

, cuit, it will be noted, ismultipled over the succeeding two contacts 11and 13 on the sequence switch 33 and .accordingly unless the next three levers to be operated are numeral levers, no code perforations can take place.

Assuming however that one of the key levers 2 is closed, four of the permutation bars 3 which are in operative relation therewith are operated to in turn move the levers 26 carrying lugs 29 in operative relation with the perforating pins 3| Simultaneously the solenoid l5 is'energized perforating the tape in accordance with the setting of the code bars. Upon the release of the operated lever 2, the solenoid 45 is deenergized stepping the tape as described above and stepping the. sequence switch to the next succeeding position. This cycle of operation is thereupon repeated while the cam portion 61 of the sequence switch 55 successively closes the contacts TI and Iii.

After the perforation of the three code combinations for each of the three numeral levers 2 which are successively operated, the sequence switch 66 is in a position at which contact pair 80 is closed and the circuit for the perforating solenoid #45 is completed over the conductor III extending to the contact I I2 controlled by the fraction key levers 3 and accordingly unless one of the fraction key levers 3 is operated at this time, no circuit can be completed for the solenoid 45. As now apparent from the above, the perforating mechanism can not function unless the levers are operated in a predetermined sequence.

During the period while the sequence switch cam portion Si is moving over the last four contacts mentioned, it will be noted that in addition to the contacts It to 18 and 80 which are operated for closing circuits for the perforator solenoid 45, contacts 43 to 15 and I9 are also operated, one contact of each of these being connected in multiple over conductor I20 to the magnet I4 and the opposite contacts being in: dividually connected over conductors HI, I41, I48 and I49 'to the front contact of armatures I21, I44, I45 and I46 of the relays I23, I3I, I32 and I33 respectively.

Depending therefore upon which if any of these relaysl23, I3! to I33 has been energized in accordance with the particular designation key which has been closed, as described above, a circuit will be completed for the magnet I4 with the sequence switch closing one of the contact pairs It to F5 and I9. In the above case, it has been assumed that the High designating key 4 was operated and accordingly that relay I3I was energized. Relay I3I it will be noted extends negative battery over the armature I44 at its front contact to conductor Ml which extends to the contact pair I4. When the sequence switch reaches the contact pair W, an energizing circuit is completed for the magnet It which upon energization rocks its armature I3 and through engagement with notch I5 moves the permutation bar I 0 to the left and a perforation on the tape in accordance with this code bar will accordingly be made. As will be described in connection with the transmitter and receiver, this particular perforation will vary the code combination of transverse row of holes containing a numeral code to indicate the index of quotations, itbeing recalled that normally only the four code bars 9 are operated by the numeral key levers and three by the fraction key levers. Thus for example had the fifth perforation oc curred during the perforation of the first numeral code combination the designation would be for an Open quotation. In the present case the fifth perforation occurs simultaneously with the perforation of the second numeral and the index designation is High.

It will also be noted that upon the operation of a fraction key lever 3, the code bars are operated as in the case of the numeral levers 2 andin addition, a sixth bar 9' is operated to the left to make a sixth perforation for the purpose to be described hereinafter. This completes a cycle of operation and the sequence switch-cam 61 moves from contact 80 to contact It. In making this last step, to energize relay I28 over conductor I 29. Relay I28 energizes and opens the locking circuit of any one relay I23 to I33 which has been energized and locked in the previous cycle and the ap paratus is now in condition to repeat the above cycle of operations. I

In the event that this order is not maintained the perforating solenoid 55 which controls the operations which produce the perforations in tape 31 is not energized and accordingly no further operations can occur, the apparatus merely remaining in a none-operated condition until the proper key levers are depressed. I In the above, a perforator arrangement has been described which requires that key lever operation be executed in a predetermined sequence, the levers controlling the perforations being arranged in groups. It will be clear that the same principle may be applied to the operation by these perforating controller levers of contactors directly connected to a signalling line so that code combinations of signals are transmitted over a line in predetermined sequence just as in the present case perforations on a tape are made in predetermined sequence.

Although the designation or range key levers are shown to energize the individual relays I23, I3I to I33, it will be evident that they can also be arranged to energize various combinations of these in the event that a greater number of code any other form of switch which successively closes contacts such as the standard telephone switch may if desired be substituted therefor.

The tape 3'! perforated in the above manner comprises groups of perforations, the first three successive cross perforations representing letter codes, the next three representing numbers and the last one representing fractions. There will also be included in the group of perforations corresponding to figures and fractions, the designation code. combination which is represented by the presence of a fifth perforation in addition to the regular figures combination.

Associated with the fraction perforations there is perforated in every case, a sixth hole'which is not perforated in any other position. This perforation does not" control the transmission of a code combination signal as do the other perforacontact BI is momentarily closed tions, but it may control the polarity of the start and stop signal pulse and so may establish and maintain the correct phase relation between the transmitting and the receiving apparatus.

By comparing the code bar 9' with the general other group. The projections lying beneath the fractions key levers 3 are inclined so that the depression of one of these key levers moves the code bar 9' to the left, Fig. 1,'while the projections occurring beneath the key lever classes I 

